This fault is a typically incorrect wiring of the Idle Validation Switch (IVS).
44.1.1
Check Idle Validation Switch Wiring
Check as follows:
1. Connect the diagnostic tool
2. Turn ignition ON (key ON, engine OFF).
3. Monitor IVS #1 and IVS #2 with the throttle pedal in the idle position.
4. If IVS #1 reads OFF and IVS #2 reads ON, verify the proper wire pin outs.
□ IVS #1 should be routed from Idle Validation Switch pin 5 to pin 6 of the CPC #1
connector.
□ IVS #2 should be routed from Validation Switch pin 6 to pin 3 of the CPC #1 connector.
5. If wiring checks OK, contact the Detroit Diesel Customer Support Center (313–592–5800).
